From 5b7c4cabbb65f5c469464da6c5f614cbd7f730f2 Mon Sep 17 00:00:00 2001 From: Linus Torvalds Date: Tue, 21 Feb 2023 18:24:12 -0800 Subject: Merge tag 'net-next-6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next Pull networking updates from Jakub Kicinski: "Core: - Add dedicated kmem_cache for typical/small skb->head, avoid having to access struct page at kfree time, and improve memory use. - Introduce sysctl to set default RPS configuration for new netdevs. - Define Netlink protocol specification format which can be used to describe messages used by each family and auto-generate parsers. Add tools for generating kernel data structures and uAPI headers. - Expose all net/core sysctls inside netns. - Remove 4s sleep in netpoll if carrier is instantly detected on boot. - Add configurable limit of MDB entries per port, and port-vlan. - Continue populating drop reasons throughout the stack. - Retire a handful of legacy Qdiscs and classifiers. Protocols: - Support IPv4 big TCP (TSO frames larger than 64kB). - Add IP_LOCAL_PORT_RANGE socket option, to control local port range on socket by socket basis. - Track and report in procfs number of MPTCP sockets used. - Support mixing IPv4 and IPv6 flows in the in-kernel MPTCP path manager. - IPv6: don't check net.ipv6.route.max_size and rely on garbage collection to free memory (similarly to IPv4). - Support Penultimate Segment Pop (PSP) flavor in SRv6 (RFC8986). - ICMP: add per-rate limit counters. - Add support for user scanning requests in ieee802154. - Remove static WEP support. - Support minimal Wi-Fi 7 Extremely High Throughput (EHT) rate reporting. - WiFi 7 EHT channel puncturing support (client & AP). BPF: - Add a rbtree data structure following the "next-gen data structure" precedent set by recently added linked list, that is, by using kfunc + kptr instead of adding a new BPF map type. - Expose XDP hints via kfuncs with initial support for RX hash and timestamp metadata. - Add BPF_F_NO_TUNNEL_KEY extension to bpf_skb_set_tunnel_key to better support decap on GRE tunnel devices not operating in collect metadata. - Improve x86 JIT's codegen for PROBE_MEM runtime error checks. - Remove the need for trace_printk_lock for bpf_trace_printk and bpf_trace_vprintk helpers. - Extend libbpf's bpf_tracing.h support for tracing arguments of kprobes/uprobes and syscall as a special case. - Significantly reduce the search time for module symbols by livepatch and BPF. - Enable cpumasks to be used as kptrs, which is useful for tracing programs tracking which tasks end up running on which CPUs in different time intervals. - Add support for BPF trampoline on s390x and riscv64. - Add capability to export the XDP features supported by the NIC. - Add __bpf_kfunc tag for marking kernel functions as kfuncs. - Add cgroup.memory=nobpf kernel parameter option to disable BPF memory accounting for container environments. Netfilter: - Remove the CLUSTERIP target. It has been marked as obsolete for years, and we still have WARN splats wrt races of the out-of-band /proc interface installed by this target. - Add 'destroy' commands to nf_tables. They are identical to the existing 'delete' commands, but do not return an error if the referenced object (set, chain, rule...) did not exist. Driver API: - Improve cpumask_local_spread() locality to help NICs set the right IRQ affinity on AMD platforms. - Separate C22 and C45 MDIO bus transactions more clearly. - Introduce new DCB table to control DSCP rewrite on egress. - Support configuration of Physical Layer Collision Avoidance (PLCA) Reconciliation Sublayer (RS) (802.3cg-2019). Modern version of shared medium Ethernet. - Support for MAC Merge layer (IEEE 802.3-2018 clause 99). Allowing preemption of low priority frames by high priority frames. - Add support for controlling MACSec offload using netlink SET. - Rework devlink instance refcounts to allow registration and de-registration under the instance lock. Split the code into multiple files, drop some of the unnecessarily granular locks and factor out common parts of netlink operation handling. - Add TX frame aggregation parameters (for USB drivers). - Add a new attr TCA_EXT_WARN_MSG to report TC (offload) warning messages with notifications for debug. - Allow offloading of UDP NEW connections via act_ct. - Add support for per action HW stats in TC. - Support hardware miss to TC action (continue processing in SW from a specific point in the action chain). - Warn if old Wireless Extension user space interface is used with modern cfg80211/mac80211 drivers. Do not support Wireless Extensions for Wi-Fi 7 devices at all. Everyone should switch to using nl80211 interface instead. - Improve the CAN bit timing configuration. Use extack to return error messages directly to user space, update the SJW handling, including the definition of a new default value that will benefit CAN-FD controllers, by increasing their oscillator tolerance. New hardware / drivers: - Ethernet: - nVidia BlueField-3 support (control traffic driver) - Ethernet support for imx93 SoCs - Motorcomm yt8531 gigabit Ethernet PHY - onsemi NCN26000 10BASE-T1S PHY (with support for PLCA) - Microchip LAN8841 PHY (incl. cable diagnostics and PTP) - Amlogic gxl MDIO mux - WiFi: - RealTek RTL8188EU (rtl8xxxu) - Qualcomm Wi-Fi 7 devices (ath12k) - CAN: - Renesas R-Car V4H Drivers: - Bluetooth: - Set Per Platform Antenna Gain (PPAG) for Intel controllers. - Ethernet NICs: - Intel (1G, igc): - support TSN / Qbv / packet scheduling features of i226 model - Intel (100G, ice): - use GNSS subsystem instead of TTY - multi-buffer XDP support - extend support for GPIO pins to E823 devices - nVidia/Mellanox: - update the shared buffer configuration on PFC commands - implement PTP adjphase function for HW offset control - TC support for Geneve and GRE with VF tunnel offload - more efficient crypto key management method - multi-port eswitch support - Netronome/Corigine: - add DCB IEEE support - support IPsec offloading for NFP3800 - Freescale/NXP (enetc): - support XDP_REDIRECT for XDP non-linear buffers - improve reconfig, avoid link flap and waiting for idle - support MAC Merge layer - Other NICs: - sfc/ef100: add basic devlink support for ef100 - ionic: rx_push mode operation (writing descriptors via MMIO) - bnxt: use the auxiliary bus abstraction for RDMA - r8169: disable ASPM and reset bus in case of tx timeout - cpsw: support QSGMII mode for J721e CPSW9G - cpts: support pulse-per-second output - ngbe: add an mdio bus driver - usbnet: optimize usbnet_bh() by avoiding unnecessary queuing - r8152: handle devices with FW with NCM support - amd-xgbe: support 10Mbps, 2.5GbE speeds and rx-adaptation - virtio-net: support multi buffer XDP - virtio/vsock: replace virtio_vsock_pkt with sk_buff - tsnep: XDP support - Ethernet high-speed switches: - nVidia/Mellanox (mlxsw): - add support for latency TLV (in FW control messages) - Microchip (sparx5): - separate explicit and implicit traffic forwarding rules, make the implicit rules always active - add support for egress DSCP rewrite - IS0 VCAP support (Ingress Classification) - IS2 VCAP filters (protos, L3 addrs, L4 ports, flags, ToS etc.) - ES2 VCAP support (Egress Access Control) - support for Per-Stream Filtering and Policing (802.1Q, 8.6.5.1) - Ethernet embedded switches: - Marvell (mv88e6xxx): - add MAB (port auth) offload support - enable PTP receive for mv88e6390 - NXP (ocelot): - support MAC Merge layer - support for the the vsc7512 internal copper phys - Microchip: - lan9303: convert to PHYLINK - lan966x: support TC flower filter statistics - lan937x: PTP support for KSZ9563/KSZ8563 and LAN937x - lan937x: support Credit Based Shaper configuration - ksz9477: support Energy Efficient Ethernet - other: - qca8k: convert to regmap read/write API, use bulk operations - rswitch: Improve TX timestamp accuracy - Intel WiFi (iwlwifi): - EHT (Wi-Fi 7) rate reporting - STEP equalizer support: transfer some STEP (connection to radio on platforms with integrated wifi) related parameters from the BIOS to the firmware. - Qualcomm 802.11ax WiFi (ath11k): - IPQ5018 support - Fine Timing Measurement (FTM) responder role support - channel 177 support - MediaTek WiFi (mt76): - per-PHY LED support - mt7996: EHT (Wi-Fi 7) support - Wireless Ethernet Dispatch (WED) reset support - switch to using page pool allocator - RealTek WiFi (rtw89): - support new version of Bluetooth co-existance - Mobile: - rmnet: support TX aggregation" * tag 'net-next-6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next: (1872 commits) page_pool: add a comment explaining the fragment counter usage net: ethtool: fix __ethtool_dev_mm_supported() implementation ethtool: pse-pd: Fix double word in comments xsk: add linux/vmalloc.h to xsk.c sefltests: netdevsim: wait for devlink instance after netns removal selftest: fib_tests: Always cleanup before exit net/mlx5e: Align IPsec ASO result memory to be as required by hardware net/mlx5e: TC, Set CT miss to the specific ct action instance net/mlx5e: Rename CHAIN_TO_REG to MAPPED_OBJ_TO_REG net/mlx5: Refactor tc miss handling to a single function net/mlx5: Kconfig: Make tc offload depend on tc skb extension net/sched: flower: Support hardware miss to tc action net/sched: flower: Move filter handle initialization earlier net/sched: cls_api: Support hardware miss to tc action net/sched: Rename user cookie and act cookie sfc: fix builds without CONFIG_RTC_LIB sfc: clean up some inconsistent indentings net/mlx4_en: Introduce flexible array to silence overflow warning net: lan966x: Fix possible deadlock inside PTP net/ulp: Remove redundant ->clone() test in inet_clone_ulp(). ... --- fs/kernfs/inode.c | 442 ++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 442 insertions(+) create mode 100644 fs/kernfs/inode.c (limited to 'fs/kernfs/inode.c') diff --git a/fs/kernfs/inode.c b/fs/kernfs/inode.c new file mode 100644 index 000000000..30494dcb0 --- /dev/null +++ b/fs/kernfs/inode.c @@ -0,0 +1,442 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * fs/kernfs/inode.c - kernfs inode implementation + * + * Copyright (c) 2001-3 Patrick Mochel + * Copyright (c) 2007 SUSE Linux Products GmbH + * Copyright (c) 2007, 2013 Tejun Heo + */ + +#include +#include +#include +#include +#include +#include +#include + +#include "kernfs-internal.h" + +static const struct inode_operations kernfs_iops = { + .permission = kernfs_iop_permission, + .setattr = kernfs_iop_setattr, + .getattr = kernfs_iop_getattr, + .listxattr = kernfs_iop_listxattr, +}; + +static struct kernfs_iattrs *__kernfs_iattrs(struct kernfs_node *kn, int alloc) +{ + static DEFINE_MUTEX(iattr_mutex); + struct kernfs_iattrs *ret; + + mutex_lock(&iattr_mutex); + + if (kn->iattr || !alloc) + goto out_unlock; + + kn->iattr = kmem_cache_zalloc(kernfs_iattrs_cache, GFP_KERNEL); + if (!kn->iattr) + goto out_unlock; + + /* assign default attributes */ + kn->iattr->ia_uid = GLOBAL_ROOT_UID; + kn->iattr->ia_gid = GLOBAL_ROOT_GID; + + ktime_get_real_ts64(&kn->iattr->ia_atime); + kn->iattr->ia_mtime = kn->iattr->ia_atime; + kn->iattr->ia_ctime = kn->iattr->ia_atime; + + simple_xattrs_init(&kn->iattr->xattrs); + atomic_set(&kn->iattr->nr_user_xattrs, 0); + atomic_set(&kn->iattr->user_xattr_size, 0); +out_unlock: + ret = kn->iattr; + mutex_unlock(&iattr_mutex); + return ret; +} + +static struct kernfs_iattrs *kernfs_iattrs(struct kernfs_node *kn) +{ + return __kernfs_iattrs(kn, 1); +} + +static struct kernfs_iattrs *kernfs_iattrs_noalloc(struct kernfs_node *kn) +{ + return __kernfs_iattrs(kn, 0); +} + +int __kernfs_setattr(struct kernfs_node *kn, const struct iattr *iattr) +{ + struct kernfs_iattrs *attrs; + unsigned int ia_valid = iattr->ia_valid; + + attrs = kernfs_iattrs(kn); + if (!attrs) + return -ENOMEM; + + if (ia_valid & ATTR_UID) + attrs->ia_uid = iattr->ia_uid; + if (ia_valid & ATTR_GID) + attrs->ia_gid = iattr->ia_gid; + if (ia_valid & ATTR_ATIME) + attrs->ia_atime = iattr->ia_atime; + if (ia_valid & ATTR_MTIME) + attrs->ia_mtime = iattr->ia_mtime; + if (ia_valid & ATTR_CTIME) + attrs->ia_ctime = iattr->ia_ctime; + if (ia_valid & ATTR_MODE) + kn->mode = iattr->ia_mode; + return 0; +} + +/** + * kernfs_setattr - set iattr on a node + * @kn: target node + * @iattr: iattr to set + * + * Return: %0 on success, -errno on failure. + */ +int kernfs_setattr(struct kernfs_node *kn, const struct iattr *iattr) +{ + int ret; + struct kernfs_root *root = kernfs_root(kn); + + down_write(&root->kernfs_rwsem); + ret = __kernfs_setattr(kn, iattr); + up_write(&root->kernfs_rwsem); + return ret; +} + +int kernfs_iop_setattr(struct mnt_idmap *idmap, struct dentry *dentry, + struct iattr *iattr) +{ + struct inode *inode = d_inode(dentry); + struct kernfs_node *kn = inode->i_private; + struct kernfs_root *root; + int error; + + if (!kn) + return -EINVAL; + + root = kernfs_root(kn); + down_write(&root->kernfs_rwsem); + error = setattr_prepare(&nop_mnt_idmap, dentry, iattr); + if (error) + goto out; + + error = __kernfs_setattr(kn, iattr); + if (error) + goto out; + + /* this ignores size changes */ + setattr_copy(&nop_mnt_idmap, inode, iattr); + +out: + up_write(&root->kernfs_rwsem); + return error; +} + +ssize_t kernfs_iop_listxattr(struct dentry *dentry, char *buf, size_t size) +{ + struct kernfs_node *kn = kernfs_dentry_node(dentry); + struct kernfs_iattrs *attrs; + + attrs = kernfs_iattrs(kn); + if (!attrs) + return -ENOMEM; + + return simple_xattr_list(d_inode(dentry), &attrs->xattrs, buf, size); +} + +static inline void set_default_inode_attr(struct inode *inode, umode_t mode) +{ + inode->i_mode = mode; + inode->i_atime = inode->i_mtime = + inode->i_ctime = current_time(inode); +} + +static inline void set_inode_attr(struct inode *inode, + struct kernfs_iattrs *attrs) +{ + inode->i_uid = attrs->ia_uid; + inode->i_gid = attrs->ia_gid; + inode->i_atime = attrs->ia_atime; + inode->i_mtime = attrs->ia_mtime; + inode->i_ctime = attrs->ia_ctime; +} + +static void kernfs_refresh_inode(struct kernfs_node *kn, struct inode *inode) +{ + struct kernfs_iattrs *attrs = kn->iattr; + + inode->i_mode = kn->mode; + if (attrs) + /* + * kernfs_node has non-default attributes get them from + * persistent copy in kernfs_node. + */ + set_inode_attr(inode, attrs); + + if (kernfs_type(kn) == KERNFS_DIR) + set_nlink(inode, kn->dir.subdirs + 2); +} + +int kernfs_iop_getattr(struct mnt_idmap *idmap, + const struct path *path, struct kstat *stat, + u32 request_mask, unsigned int query_flags) +{ + struct inode *inode = d_inode(path->dentry); + struct kernfs_node *kn = inode->i_private; + struct kernfs_root *root = kernfs_root(kn); + + down_read(&root->kernfs_rwsem); + kernfs_refresh_inode(kn, inode); + generic_fillattr(&nop_mnt_idmap, inode, stat); + up_read(&root->kernfs_rwsem); + + return 0; +} + +static void kernfs_init_inode(struct kernfs_node *kn, struct inode *inode) +{ + kernfs_get(kn); + inode->i_private = kn; + inode->i_mapping->a_ops = &ram_aops; + inode->i_op = &kernfs_iops; + inode->i_generation = kernfs_gen(kn); + + set_default_inode_attr(inode, kn->mode); + kernfs_refresh_inode(kn, inode); + + /* initialize inode according to type */ + switch (kernfs_type(kn)) { + case KERNFS_DIR: + inode->i_op = &kernfs_dir_iops; + inode->i_fop = &kernfs_dir_fops; + if (kn->flags & KERNFS_EMPTY_DIR) + make_empty_dir_inode(inode); + break; + case KERNFS_FILE: + inode->i_size = kn->attr.size; + inode->i_fop = &kernfs_file_fops; + break; + case KERNFS_LINK: + inode->i_op = &kernfs_symlink_iops; + break; + default: + BUG(); + } + + unlock_new_inode(inode); +} + +/** + * kernfs_get_inode - get inode for kernfs_node + * @sb: super block + * @kn: kernfs_node to allocate inode for + * + * Get inode for @kn. If such inode doesn't exist, a new inode is + * allocated and basics are initialized. New inode is returned + * locked. + * + * Locking: + * Kernel thread context (may sleep). + * + * Return: + * Pointer to allocated inode on success, %NULL on failure. + */ +struct inode *kernfs_get_inode(struct super_block *sb, struct kernfs_node *kn) +{ + struct inode *inode; + + inode = iget_locked(sb, kernfs_ino(kn)); + if (inode && (inode->i_state & I_NEW)) + kernfs_init_inode(kn, inode); + + return inode; +} + +/* + * The kernfs_node serves as both an inode and a directory entry for + * kernfs. To prevent the kernfs inode numbers from being freed + * prematurely we take a reference to kernfs_node from the kernfs inode. A + * super_operations.evict_inode() implementation is needed to drop that + * reference upon inode destruction. + */ +void kernfs_evict_inode(struct inode *inode) +{ + struct kernfs_node *kn = inode->i_private; + + truncate_inode_pages_final(&inode->i_data); + clear_inode(inode); + kernfs_put(kn); +} + +int kernfs_iop_permission(struct mnt_idmap *idmap, + struct inode *inode, int mask) +{ + struct kernfs_node *kn; + struct kernfs_root *root; + int ret; + + if (mask & MAY_NOT_BLOCK) + return -ECHILD; + + kn = inode->i_private; + root = kernfs_root(kn); + + down_read(&root->kernfs_rwsem); + kernfs_refresh_inode(kn, inode); + ret = generic_permission(&nop_mnt_idmap, inode, mask); + up_read(&root->kernfs_rwsem); + + return ret; +} + +int kernfs_xattr_get(struct kernfs_node *kn, const char *name, + void *value, size_t size) +{ + struct kernfs_iattrs *attrs = kernfs_iattrs_noalloc(kn); + if (!attrs) + return -ENODATA; + + return simple_xattr_get(&attrs->xattrs, name, value, size); +} + +int kernfs_xattr_set(struct kernfs_node *kn, const char *name, + const void *value, size_t size, int flags) +{ + struct kernfs_iattrs *attrs = kernfs_iattrs(kn); + if (!attrs) + return -ENOMEM; + + return simple_xattr_set(&attrs->xattrs, name, value, size, flags, NULL); +} + +static int kernfs_vfs_xattr_get(const struct xattr_handler *handler, + struct dentry *unused, struct inode *inode, + const char *suffix, void *value, size_t size) +{ + const char *name = xattr_full_name(handler, suffix); + struct kernfs_node *kn = inode->i_private; + + return kernfs_xattr_get(kn, name, value, size); +} + +static int kernfs_vfs_xattr_set(const struct xattr_handler *handler, + struct mnt_idmap *idmap, + struct dentry *unused, struct inode *inode, + const char *suffix, const void *value, + size_t size, int flags) +{ + const char *name = xattr_full_name(handler, suffix); + struct kernfs_node *kn = inode->i_private; + + return kernfs_xattr_set(kn, name, value, size, flags); +} + +static int kernfs_vfs_user_xattr_add(struct kernfs_node *kn, + const char *full_name, + struct simple_xattrs *xattrs, + const void *value, size_t size, int flags) +{ + atomic_t *sz = &kn->iattr->user_xattr_size; + atomic_t *nr = &kn->iattr->nr_user_xattrs; + ssize_t removed_size; + int ret; + + if (atomic_inc_return(nr) > KERNFS_MAX_USER_XATTRS) { + ret = -ENOSPC; + goto dec_count_out; + } + + if (atomic_add_return(size, sz) > KERNFS_USER_XATTR_SIZE_LIMIT) { + ret = -ENOSPC; + goto dec_size_out; + } + + ret = simple_xattr_set(xattrs, full_name, value, size, flags, + &removed_size); + + if (!ret && removed_size >= 0) + size = removed_size; + else if (!ret) + return 0; +dec_size_out: + atomic_sub(size, sz); +dec_count_out: + atomic_dec(nr); + return ret; +} + +static int kernfs_vfs_user_xattr_rm(struct kernfs_node *kn, + const char *full_name, + struct simple_xattrs *xattrs, + const void *value, size_t size, int flags) +{ + atomic_t *sz = &kn->iattr->user_xattr_size; + atomic_t *nr = &kn->iattr->nr_user_xattrs; + ssize_t removed_size; + int ret; + + ret = simple_xattr_set(xattrs, full_name, value, size, flags, + &removed_size); + + if (removed_size >= 0) { + atomic_sub(removed_size, sz); + atomic_dec(nr); + } + + return ret; +} + +static int kernfs_vfs_user_xattr_set(const struct xattr_handler *handler, + struct mnt_idmap *idmap, + struct dentry *unused, struct inode *inode, + const char *suffix, const void *value, + size_t size, int flags) +{ + const char *full_name = xattr_full_name(handler, suffix); + struct kernfs_node *kn = inode->i_private; + struct kernfs_iattrs *attrs; + + if (!(kernfs_root(kn)->flags & KERNFS_ROOT_SUPPORT_USER_XATTR)) + return -EOPNOTSUPP; + + attrs = kernfs_iattrs(kn); + if (!attrs) + return -ENOMEM; + + if (value) + return kernfs_vfs_user_xattr_add(kn, full_name, &attrs->xattrs, + value, size, flags); + else + return kernfs_vfs_user_xattr_rm(kn, full_name, &attrs->xattrs, + value, size, flags); + +} + +static const struct xattr_handler kernfs_trusted_xattr_handler = { + .prefix = XATTR_TRUSTED_PREFIX, + .get = kernfs_vfs_xattr_get, + .set = kernfs_vfs_xattr_set, +}; + +static const struct xattr_handler kernfs_security_xattr_handler = { + .prefix = XATTR_SECURITY_PREFIX, + .get = kernfs_vfs_xattr_get, + .set = kernfs_vfs_xattr_set, +}; + +static const struct xattr_handler kernfs_user_xattr_handler = { + .prefix = XATTR_USER_PREFIX, + .get = kernfs_vfs_xattr_get, + .set = kernfs_vfs_user_xattr_set, +}; + +const struct xattr_handler *kernfs_xattr_handlers[] = { + &kernfs_trusted_xattr_handler, + &kernfs_security_xattr_handler, + &kernfs_user_xattr_handler, + NULL +}; -- cgit v1.2.3